CN114198350A - Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system - Google Patents

Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system Download PDF

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Publication number
CN114198350A
CN114198350A CN202210032165.1A CN202210032165A CN114198350A CN 114198350 A CN114198350 A CN 114198350A CN 202210032165 A CN202210032165 A CN 202210032165A CN 114198350 A CN114198350 A CN 114198350A
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CN
China
Prior art keywords
steering
valve
port
oil
reversing valve
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CN202210032165.1A
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Chinese (zh)
Inventor
李婧
李文锋
罗升
金伟标
杨丰先
何景泉
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Hangcha Group Co Ltd
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Hangcha Group Co Ltd
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Publication date
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Priority to CN202210032165.1A priority Critical patent/CN114198350A/en
Publication of CN114198350A publication Critical patent/CN114198350A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/09—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
    • B62D5/12—Piston and cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07568—Steering arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Civil Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

The application discloses a monostable shunt type hydraulic system with controllable industrial vehicle machinery and electro-hydraulic steering, which comprises an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder; the multi-way valve assembly is connected with the oil tank, the multi-way valve assembly is connected with the steering control valve assembly, and the steering control valve assembly is connected with the steering oil cylinder; the steering control valve component comprises a first reversing valve, a second reversing valve and a third reversing valve which are connected in sequence; the steering gear is connected with the steering control valve assembly and is connected with the steering oil cylinder; the steering signal valve is connected with the steering gear, and the steering signal valve is connected with the second reversing valve. The hydraulic system can realize automatic electro-hydraulic steering control, and can realize manual steering when a mechanical steering wheel is manually operated in the automatic electro-hydraulic steering control process, and ensure that the priority of the manual steering is higher than that of the automatic electro-hydraulic steering control, thereby greatly improving the safety of vehicle operation.

Description

Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system
Technical Field
The application relates to the technical field of hydraulic control, in particular to a monostable shunt type hydraulic system with controllable mechanical and electrohydraulic steering of an industrial vehicle.
Background
At present, the steering function of the diesel fork lift truck is realized by connecting a mechanical steering column through a steering wheel, mechanically connecting the mechanical steering column to a steering gear and supplying oil to a steering oil cylinder through the steering gear. However, the steering function in the prior art is realized by connecting a mechanical control mechanism with a steering gear, and a manual control steering wheel is required to realize the steering function. Therefore, according to the application requirements of the forklift, a hydraulic system capable of realizing automatic control or remote control needs to be provided timely.
Disclosure of Invention
The application aims to provide a monostable shunting type hydraulic system with controllable mechanical and electrohydraulic steering of an industrial vehicle, which can realize automatic steering control and guarantee the priority of artificial steering.
In order to achieve the purpose, the application provides a monostable shunt type hydraulic system with controllable industrial vehicle machinery and electro-hydraulic steering, which comprises an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder;
a P port of the multi-way valve assembly is connected with the oil tank, a CF port of the multi-way valve assembly is connected with a P port of the steering control valve assembly, and an L port and an R port of the steering control valve assembly are respectively connected with a cavity A and a cavity B of the steering oil cylinder;
the steering control valve assembly comprises a first reversing valve, a second reversing valve and a third reversing valve, the first reversing valve is connected with a P port of the steering control valve assembly, the second reversing valve is connected with the first reversing valve, the third reversing valve is connected with the second reversing valve, and the third reversing valve is connected with an L port and an R port of the steering control valve assembly;
when the system receives a first steering signal, the first reversing valve is electrified to reverse, oil in the oil tank is conveyed to a P port of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first reversing valve, the second reversing valve and the third reversing valve in sequence to achieve steering;
the system also comprises a steering gear and a steering signal valve, wherein a port P of the steering gear is connected with a port P1 of the steering control valve assembly, and a port L and a port R of the steering gear are respectively connected with a cavity A and a cavity B of the steering oil cylinder; a port P1 and a port P2 of the turn signal valve are respectively connected with a port L and a port R of the steering gear, and a port PP of the turn signal valve is connected with a signal port of the second reversing valve;
when the system receives a second steering signal, a pressure signal generated by the steering gear is transmitted to a signal port of the second reversing valve through the steering signal valve so as to reverse the second reversing valve, oil in the oil tank is conveyed to a port P of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first reversing valve, the second reversing valve and the steering gear in sequence, and therefore steering is achieved.
Optionally, the multi-way valve assembly comprises a monostable shunt valve and a check valve, an oil inlet of the monostable shunt valve is connected with the oil tank, an oil outlet of the monostable shunt valve is connected with an oil inlet of the check valve, and an oil outlet of the check valve is connected with a port P of the steering control valve assembly.
Optionally, the multi-way valve assembly further comprises an overflow valve, an oil inlet of the overflow valve is connected with an oil outlet of the monostable flow divider valve, and an oil outlet of the overflow valve is connected with the oil tank.
Optionally, the device further comprises a power assembly connected with the oil tank and used for supplying the monostable shunt valve after the oil is sucked from the oil tank.
Optionally, an oil suction filter is connected between the power assembly and the oil tank.
Optionally, the steering control valve assembly further comprises a fourth reversing valve;
the signal port of the fourth reversing valve is connected with the signal port of the third reversing valve;
an oil inlet of the fourth reversing valve is connected with an oil outlet of the second reversing valve;
and an oil outlet of the fourth reversing valve is connected with the oil tank.
Optionally, the first reversing valve is a two-position three-way electromagnetic reversing valve, the second reversing valve is a two-position three-way hydraulic control reversing valve, the third reversing valve is a three-position five-way electric proportional reversing valve, and the fourth reversing valve is a two-position two-way hydraulic control reversing valve.
Optionally, a bidirectional hydraulic lock is connected between the steering gear and the steering cylinder, and between the third reversing valve and the steering cylinder.
Optionally, the T port of the steering gear is connected to the fuel tank.
Compared with the background art, the industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system comprises an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder.
The port P of the multi-way valve component is connected with an oil tank, the port CF of the multi-way valve component is connected with the port P of the steering control valve component, and the port L and the port R of the steering control valve component are respectively connected with the cavity A and the cavity B of the steering oil cylinder; further, the steering control valve assembly comprises a first reversing valve, a second reversing valve and a third reversing valve, wherein the first reversing valve is connected with a port P of the steering control valve assembly, the second reversing valve is connected with the first reversing valve, the third reversing valve is connected with the second reversing valve, and the third reversing valve is connected with a port L and a port R of the steering control valve assembly.
Therefore, when the system receives a first steering signal, the first reversing valve is electrically reversed, oil in the oil tank is conveyed to the port P of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first reversing valve, the second reversing valve and the third reversing valve in sequence, and steering is achieved. Specifically, the first steering signal may be a steering signal sent by an electronic steering wheel or a steering signal sent by an unmanned system, and after receiving the steering signal, the hydraulic system may electrically reverse the first reversing valve, thereby further implementing electro-hydraulic steering through the first reversing valve, the second reversing valve, and the third reversing valve.
The system also comprises a steering gear and a steering signal valve, wherein a port P of the steering gear is connected with a port P1 of the steering control valve assembly, and a port L and a port R of the steering gear are respectively connected with a cavity A and a cavity B of the steering oil cylinder; a P1 port and a P2 port of the steering signal valve are respectively connected with an L port and an R port of the steering gear, and a PP port of the steering signal valve is connected with a signal port of the second reversing valve;
in this way, when the system receives a second steering signal, a pressure signal generated by the steering gear is transmitted to the signal port of the second reversing valve through the steering signal valve so as to reverse the second reversing valve, oil in the oil tank is conveyed to the port P of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first reversing valve, the second reversing valve and the steering gear in sequence, and thus steering is achieved. Specifically, the second steering signal may be a steering signal obtained by manually operating a mechanical steering wheel when the system is in electro-hydraulic steering, and after the hydraulic system receives the steering signal, the second reversing valve may be electrically reversed, so that manual preferential steering is further realized through the first reversing valve, the second reversing valve and the steering gear.
Compared with a traditional hydraulic system which cannot realize automatic control, the hydraulic system provided by the application can realize automatic electro-hydraulic steering control on the one hand, and can realize manual steering when a mechanical steering wheel is manually operated in the automatic electro-hydraulic steering control process on the other hand, and ensures that the priority of the manual steering is higher than that of the automatic electro-hydraulic steering control, thereby greatly improving the safety of vehicle operation.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a mechanically and electro-hydraulically steerable monostable shunt-type hydraulic system for an industrial vehicle according to an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of the connection of a steering control valve assembly in the mechanically and electro-hydraulically steerable monostable shunt hydraulic system of the industrial vehicle of FIG. 1.
Wherein:
the hydraulic steering system comprises an oil tank 1, an oil suction filter 2, a power assembly 3, a multi-way valve assembly 4, a monostable shunt valve 41, a one-way valve 42, an overflow valve 43, a steering gear 5, a steering control valve assembly 6, a first reversing valve 61, a second reversing valve 62, a third reversing valve 63, a fourth reversing valve 64, a steering signal valve 7, a bidirectional hydraulic lock 8 and a steering oil cylinder 9.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to enable those skilled in the art to better understand the scheme of the present application, the present application will be described in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a monostable shunt type hydraulic system with controllable mechanical and electro-hydraulic steering of an industrial vehicle according to an embodiment of the present application; FIG. 2 is a schematic illustration of the connection of a steering control valve assembly in the mechanically and electro-hydraulically steerable monostable shunt hydraulic system of the industrial vehicle of FIG. 1.
The industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system comprises an oil tank 1, a multi-way valve assembly 4, a steering control valve assembly 6 and a steering oil cylinder 9.
A port P of the multi-way valve assembly 4 is connected with the oil tank 1, a port CF of the multi-way valve assembly 4 is connected with a port P of the steering control valve assembly 6, and a port L and a port R of the steering control valve assembly 6 are respectively connected with a cavity A and a cavity B of the steering oil cylinder 9; further, the steering control valve assembly 6 includes a first direction valve 61, a second direction valve 62 and a third direction valve 63, the first direction valve 61 is connected to the port P of the steering control valve assembly 6, that is, the first direction valve 61 is connected to the port CF of the multi-way valve assembly 4, the oil inlet of the second direction valve 62 is connected to the oil outlet of the first direction valve 61, the oil inlet of the third direction valve 63 is connected to the oil outlet of the second direction valve 62, the oil outlet of the third direction valve 63 is connected to the ports L and R of the steering control valve assembly 6, that is, the oil outlet of the third direction valve 63 is connected to the chambers a and B of the steering cylinder 9.
In this way, when the system receives a first steering signal, the first direction changing valve 61 is electrically changed, and the oil in the oil tank 1 is delivered to the port P of the steering control valve assembly 6 through the multi-way valve assembly 4 and is delivered to the steering cylinder 9 through the first direction changing valve 61, the second direction changing valve 62 and the third direction changing valve 63 in sequence to achieve steering.
It should be noted that the first steering signal may be a steering signal sent by an electronic steering wheel, or may be a steering signal sent by an unmanned system, and after receiving the steering signal, the hydraulic system may electrically reverse the first direction valve 61, so as to further implement electro-hydraulic steering through the first direction valve 61, the second direction valve 62, and the third direction valve 63.
The system also comprises a steering gear 5 and a steering signal valve 7, wherein the steering signal valve 7 is a shuttle valve, the shuttle valve comprises a first oil inlet P1, a second oil inlet P2 and a working port PP, a port P of the steering gear 5 is connected with a port P1 of a steering control valve assembly 6, and a port L and a port R of the steering gear 5 are respectively connected with a cavity A and a cavity B of the steering oil cylinder 9; a port P1 and a port P2 of the turn signal valve 7 are respectively connected with a port L and a port R of the steering gear 5, and a port PP of the turn signal valve 7 is connected with a signal port of the second reversing valve 62;
in this way, when the system receives the second steering signal, the pressure signal generated by the steering gear 5 is transmitted to the signal port of the second direction changing valve 62 through the steering signal valve 7 to change the direction of the second direction changing valve 62, so that the oil in the oil tank 1 can be conveyed to the port P of the steering control valve assembly 6 through the multi-way valve assembly 4 and conveyed to the steering cylinder 9 through the first direction changing valve 61, the second direction changing valve 62 and the steering gear 5 in sequence, thereby realizing the steering.
It should be noted that the second steering signal may be a steering signal obtained by manually operating a mechanical steering wheel when the system is in electro-hydraulic steering, and after receiving the steering signal, the hydraulic system may electrically reverse the second direction valve 62, so as to further implement manual preferential steering through the first direction valve 61, the second direction valve 62 and the steering gear 5.
Compared with a traditional hydraulic system which cannot realize automatic control, the hydraulic system provided by the application can realize automatic electro-hydraulic steering control on the one hand, and can realize manual steering when a mechanical steering wheel is manually operated in the automatic electro-hydraulic steering control process on the other hand, and ensures that the priority of the manual steering is higher than that of the automatic electro-hydraulic steering control, thereby greatly improving the safety of vehicle operation.
In the embodiment, the multi-way valve assembly 4 comprises a monostable shunt valve 41 and a check valve 42, an oil inlet of the monostable shunt valve 41 is connected with the oil tank 1, an oil outlet of the monostable shunt valve 41 is connected with an oil inlet of the check valve 42, and an oil outlet of the check valve 42 is connected with a port P of the steering control valve assembly 6. The monostable shunt valve 41 can supply a fixed flow rate of oil to the steering oil passage.
Meanwhile, the system also comprises a power assembly 3, wherein the power assembly 3 is connected with the oil tank 1, and the power assembly 3 is used for sucking oil from the oil tank 1 and then supplying the oil to the monostable flow divider valve 41. Of course, the power assembly 3 may be embodied as a gear pump.
Certainly, according to actual need, an oil absorption oil filter 2 can be connected between the power assembly 3 and the oil tank 1, so that the cleanliness of oil used by the system is improved, and the reliability of the operation of the system is guaranteed.
Thus, when the system is started, the gear pump sucks oil from the oil tank 1, and the oil passes through the oil suction filter 2, is supplied to the multi-way valve assembly 4, and is supplied to the P port of the steering control valve assembly 6 through the one-way shunt valve 41 of the multi-way valve assembly 4.
In addition, the multi-way valve assembly 4 further comprises an overflow valve 43, an oil inlet of the overflow valve 43 is connected with an oil outlet of the monostable flow divider valve 41, and an oil outlet of the overflow valve 43 is connected with the oil tank 1. The overflow valve 43 plays a safety protection role in the system, when the system pressure exceeds a specified value, the overflow valve 43 is ejected, and a part of oil in the system is discharged into the oil tank 1, so that the system pressure does not exceed an allowable value, and the system is ensured not to have an accident due to overhigh pressure.
In the present embodiment, the steering control valve assembly 6 further includes a fourth direction valve 64; a signal port of the fourth reversing valve 64 is connected with a signal port of the third reversing valve 63, an oil inlet of the fourth reversing valve 64 is connected with an oil outlet of the second reversing valve 62, and an oil outlet of the fourth reversing valve 64 is connected with the oil tank 1. The fourth directional control valve 64 is used to provide a drain protection when the third directional control valve 63 does not receive a directional control signal but a directional control occurs.
In the steering control valve assembly 6, the first directional valve 61 is a two-position three-way electromagnetic directional valve, the second directional valve 62 is a two-position three-way pilot-controlled directional valve, the third directional valve 63 is a three-position five-way electric proportional directional valve, and the fourth directional valve 64 is a two-position two-way pilot-controlled directional valve.
In order to lock the steering oil cylinder 9, a bidirectional hydraulic lock 8 is connected between the steering gear 5 and the steering oil cylinder 9 and between the third reversing valve 63 and the steering oil cylinder 9, wherein the bidirectional hydraulic lock 8 is formed by combining two hydraulic control one-way valves into the bidirectional hydraulic lock 8, the principle is that the two hydraulic control one-way valves take the pressure of the opposite oil way as pilot oil, and when one pipeline has no pressure, the other pipeline is closed at the same time.
The two-way hydraulic lock 8 can close the two hydraulic control one-way valves when the third reversing valve 63 or the reversing valve in the steering gear 5 is in the middle position, so that oil in the AB two cavities of the steering oil cylinder 9 can be tightly sealed, and the piston of the steering oil cylinder 9 cannot move under the action of external force, so that the stability and reliability of the system are ensured.
In the embodiment, the T port of the steering gear 5 is connected with the oil tank 1, so that when the vehicle loses power and oil cannot be provided for the steering gear 5, the steering wheel is manually operated to enable the steering gear 5 to suck the oil from the T port, pass through the internal one-way valve and then supply the oil to the steering oil cylinder 9, and therefore the manual steering without power of the vehicle is realized. Therefore, when the electro-hydraulic steering signal fails or the system goes wrong, the vehicle can still be ensured to have the steering function.
In conclusion, the hydraulic system of this application can provide three kinds and turn to the mode, and the first kind turns to the mode and is the manpower under the vehicle unpowered condition and turns to, and the second kind turns to the mode and controls hydraulic steering for the manpower, and the third kind turns to the mode and turns to for automatic electricity liquid.
The working state of the first steering mode is as follows: when the vehicle loses power, the gear pump does not rotate, and can not provide oil for the steering gear 5, and when the steering wheel is manually operated, the steering gear 5 can suck oil from a T port of the steering gear 5 and supply the oil to the steering oil cylinder 9 through the internal one-way valve, so that manual steering is realized.
The working state of the second steering mode is as follows: manually operating hydraulic steering, wherein at the moment, the whole vehicle runs, the gear pump sucks oil from the oil tank 1, the oil passes through the oil suction filter 2 and then is supplied to the monostable shunt valve 41 of the multi-way valve assembly 4, and the CF port of the multi-way valve assembly 4 is connected to the P port of the steering control valve assembly 6, so the oil passes through the monostable shunt valve 41 and the check valve 42 successively and then is supplied to the P port of the steering control valve assembly 6; at this time, the electro-hydraulic steering mode is not opened, the first reversing valve 61 is not electrified (is positioned at the right position), oil is supplied to a port P1 of the steering control valve assembly 6 after passing through a port B of the first reversing valve 61 and is supplied to a port P of the steering gear 5 through a port P1 of the steering control valve assembly 6, and when the steering is manually performed, the oil is supplied to the steering oil cylinder 9 under the action of the steering gear 5 so as to realize steering action; when there is no steering action, the oil will flow back to the oil return channel of the multi-way valve assembly 4 through the T-port of the steering gear 5 and back to the oil tank 1.
The third steering mode is an automatic electro-hydraulic steering mode: when an electronic steering wheel has a steering signal or an unmanned system sends the steering signal, electro-hydraulic steering is realized, oil is supplied to a port P of a steering control valve assembly 6 through a monostable shunt valve 41, at the moment, a first reversing valve 61 is electrically commutated (commutated to the left position), the oil is supplied to a second reversing valve 62 (at the lower position) after passing through a port A of the first reversing valve 61, and is supplied to a third reversing valve 63 and a fourth reversing valve 64 through the second reversing valve 62, at the moment, as the third reversing valve 63 is controlled by an electric signal (at the left position), the commutated oil is supplied to one end of a steering oil cylinder 9 through a bidirectional hydraulic lock 8, a steering function is realized, at the moment, as the steering action exists, pressure oil acts on a signal port of the fourth reversing valve 64 at a signal port of the third reversing valve 63, and therefore the fourth reversing valve 64 is ensured to be at the upper position; if the third reversing valve 63 does not receive the steering signal and the third reversing valve 63 reverses, no pressure oil exists in the signal port of the fourth reversing valve 64, the pressure of the oil inlet of the fourth reversing valve 64 rises, and when the pressure exceeds the pressure of the valve control spring, the fourth reversing valve 64 reverses to the lower position, so that the oil is unloaded to the T port, and the system safety is ensured.
When the system is in a third steering mode, namely an automatic electro-hydraulic steering mode, a mechanical steering wheel is manually operated, manual operation is set to be preferred through an oil circuit of the system, when the system mainly depends on the manual steering, a steering pressure signal is obtained through a steering signal valve 7 and is transmitted to a PP port of a steering control valve assembly 6 through the PP port, at the moment, the pressure signal acts on a hydraulic signal port of a second reversing valve 62 and reverses the second reversing valve 62 to an upper position, so that even if the electro-hydraulic steering signal reverses the first reversing valve 61, oil is supplied to the second reversing valve 62 and then is supplied to a steering gear 5 through a P1 port of the steering control valve assembly 6, and the manual mechanical steering is realized; furthermore, even if the third direction changing valve 63 is energized, the electro-hydraulic steering function is not activated because oil cannot be supplied through the second direction changing valve 62, so that the highest priority of the manual steering is ensured.
Meanwhile, two-way hydraulic locks 8 are connected between the steering gear 5 and the steering oil cylinder 9 and between the third reversing valve 63 and the steering oil cylinder 9, and the automatic electro-hydraulic steering mode and the manual steering priority mode can be isolated through the two-way hydraulic locks 8, so that the two working modes are not interfered with each other.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system provided by the application is described in detail above. The principle and the implementation of the present application are explained herein by using specific examples, and the above descriptions of the examples are only used to help understand the scheme and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (9)

1. A monostable shunt type hydraulic system with controllable industrial vehicle machinery and electro-hydraulic steering is characterized by comprising an oil tank, a multi-way valve assembly, a steering control valve assembly and a steering oil cylinder;
a P port of the multi-way valve assembly is connected with the oil tank, a CF port of the multi-way valve assembly is connected with a P port of the steering control valve assembly, and an L port and an R port of the steering control valve assembly are respectively connected with a cavity A and a cavity B of the steering oil cylinder;
the steering control valve assembly comprises a first reversing valve, a second reversing valve and a third reversing valve, the first reversing valve is connected with a P port of the steering control valve assembly, the second reversing valve is connected with the first reversing valve, the third reversing valve is connected with the second reversing valve, and the third reversing valve is connected with an L port and an R port of the steering control valve assembly;
when the system receives a first steering signal, the first reversing valve is electrified to reverse, oil in the oil tank is conveyed to a P port of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first reversing valve, the second reversing valve and the third reversing valve in sequence to achieve steering;
the system also comprises a steering gear and a steering signal valve, wherein a port P of the steering gear is connected with a port P1 of the steering control valve assembly, and a port L and a port R of the steering gear are respectively connected with a cavity A and a cavity B of the steering oil cylinder; a port P1 and a port P2 of the turn signal valve are respectively connected with a port L and a port R of the steering gear, and a port PP of the turn signal valve is connected with a signal port of the second reversing valve;
when the system receives a second steering signal, a pressure signal generated by the steering gear is transmitted to a signal port of the second reversing valve through the steering signal valve so as to reverse the second reversing valve, oil in the oil tank is conveyed to a port P of the steering control valve assembly through the multi-way valve assembly and is conveyed to the steering oil cylinder through the first reversing valve, the second reversing valve and the steering gear in sequence, and therefore steering is achieved.
2. The industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system of claim 1, wherein the multi-way valve assembly includes a monostable shunt valve and a check valve, an oil inlet of the monostable shunt valve is connected with the oil tank, an oil outlet of the monostable shunt valve is connected with an oil inlet of the check valve, and an oil outlet of the check valve is connected with port P of the steering control valve assembly.
3. The industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system of claim 2, wherein the multi-way valve assembly further includes an overflow valve, an oil inlet of the overflow valve is connected to an oil outlet of the monostable shunt valve, and an oil outlet of the overflow valve is connected to the oil tank.
4. The industrial vehicle mechanically and electrically controlled monostable shunt type hydraulic system of claim 2 further including a power pack connected to the tank for drawing oil from the tank to supply the monostable shunt valve.
5. The industrial vehicle mechanically and electrically controlled monostable shunt type hydraulic system of claim 4 wherein an oil suction filter is connected between the power pack and the tank.
6. The industrial vehicle mechanically and electrically controlled steering monostable shunt type hydraulic system of claim 1 wherein the steering control valve assembly further includes a fourth reversing valve;
the signal port of the fourth reversing valve is connected with the signal port of the third reversing valve;
an oil inlet of the fourth reversing valve is connected with an oil outlet of the second reversing valve;
and an oil outlet of the fourth reversing valve is connected with the oil tank.
7. The industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system of claim 6, wherein the first directional valve is a two-position three-way electromagnetic directional valve, the second directional valve is a two-position three-way hydraulic control directional valve, the third directional valve is a three-position five-way electric proportional directional valve, and the fourth directional valve is a two-position two-way hydraulic control directional valve.
8. The industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system as claimed in claim 1, wherein a bidirectional hydraulic lock is connected between the steering gear and the steering cylinder, and between the third direction changing valve and the steering cylinder.
9. The industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system according to any one of claims 1 to 8, wherein the T port of the steering gear is connected to the tank.
CN202210032165.1A 2022-01-12 2022-01-12 Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system Pending CN114198350A (en)

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CN202210032165.1A CN114198350A (en) 2022-01-12 2022-01-12 Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system

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Application Number Priority Date Filing Date Title
CN202210032165.1A CN114198350A (en) 2022-01-12 2022-01-12 Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system

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CN114198350A true CN114198350A (en) 2022-03-18

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CN202210032165.1A Pending CN114198350A (en) 2022-01-12 2022-01-12 Industrial vehicle mechanical and electro-hydraulic steering controllable monostable shunt type hydraulic system

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